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flasgger 0.6.3

Extract swagger specs from your flask project

# Flasgger
## Easy Swagger UI for your Flask API

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![flasgger](docs/flasgger.png)

Flasgger is a Flask extension to **extract [OpenAPI=Specification](https://github.com/OAI/OpenAPI-Specification/blob/master/versions/2.0.md#operation-object)** from all Flask views registered in your API.

Flasgger also comes with **[SwaggerUI](http://swagger.io/swagger-ui/) embedded** so you can access [http://localhost:5000/apidocs](localhost:5000/apidocs) and visualize and interact with your API resources.

Flasgger also **provides validation** of the incoming data, using the same specification it can validates if the data received as as a POST, PUT, PATCH is valid against the schema defined using **YAML**, **Python dictionaries** or **Marshmallow Schemas**.

Flasgger can work with simple function views or MethodViews using docstring for especification, or using `@swag_from` decorator to get specification from **YAML** or **dict** and also provides **SwaggerView** which can use **Marshmallow Schemas** as specification.

Flasgger is compatible with `Flask-RESTful` so you can use `Resources` and `swag` specifications together, take a look at [restful example.](examples/restful.py)

Flasgger also supports `Marshmallow APISpec` as base template for specification, if you are using APISPec from Marshmallow take a look at [apispec example.](examples/apispec_example.py)


# Installation

> under your virtualenv do:

```
pip install flasgger
```

or (dev version)

```
pip install https://github.com/rochacbruno/flasgger/tarball/master
```

> NOTE: If you want to use **Marshmallow Schemas** you also need to run `pip install marshmallow apispec`

# Getting started

## Using docstrings as specification

Create a file called for example `colors.py`

```python
from flask import Flask, jsonify
from flasgger import Swagger

app = Flask(__name__)
Swagger(app)

@app.route('/colors/<palette>/')
def colors(palette):
"""Example endpoint returning a list of colors by palette
This is using docstrings for specifications.
---
parameters:
- name: palette
in: path
type: string
enum: ['all', 'rgb', 'cmyk']
required: true
default: all
definitions:
Palette:
type: object
properties:
palette_name:
type: array
items:
$ref: '#/definitions/Color'
Color:
type: string
responses:
200:
description: A list of colors (may be filtered by palette)
schema:
$ref: '#/definitions/Palette'
examples:
rgb: ['red', 'green', 'blue']
"""
all_colors = {
'cmyk': ['cian', 'magenta', 'yellow', 'black'],
'rgb': ['red', 'green', 'blue']
}
if palette == 'all':
result = all_colors
else:
result = {palette: all_colors.get(palette)}

return jsonify(result)

app.run(debug=True)
```

Now run:

```
python colors.py
```

And go to: [http://localhost:5000/apidocs/](http://localhost:5000/apidocs/)

You should get:

![colors](docs/colors.png)

## Using external YAML files

Save a new file `colors.yml`

```yaml
Example endpoint returning a list of colors by palette
In this example the specification is taken from external YAML file
---
parameters:
- name: palette
in: path
type: string
enum: ['all', 'rgb', 'cmyk']
required: true
default: all
definitions:
Palette:
type: object
properties:
palette_name:
type: array
items:
$ref: '#/definitions/Color'
Color:
type: string
responses:
200:
description: A list of colors (may be filtered by palette)
schema:
$ref: '#/definitions/Palette'
examples:
rgb: ['red', 'green', 'blue']
```


lets use the same example changing only the view function.

```python
from flasgger import swag_from

@app.route('/colors/<palette>/')
@swag_from('colors.yml')
def colors(palette):
...
```

If you do not want to use the decorator you can use the docsting `file:` shortcut.

```python
@app.route('/colors/<palette>/')
def colors(palette):
"""
file: colors.yml
"""
...
```


## Using dictionaries as raw specs

Create a Python dictionary as:

```python
specs_dict = {
"parameters": [
{
"name": "palette",
"in": "path",
"type": "string",
"enum": [
"all",
"rgb",
"cmyk"
],
"required": true,
"default": "all"
}
],
"definitions": {
"Palette": {
"type": "object",
"properties": {
"palette_name": {
"type": "array",
"items": {
"$ref": "#/definitions/Color"
}
}
}
},
"Color": {
"type": "string"
}
},
"responses": {
"200": {
"description": "A list of colors (may be filtered by palette)",
"schema": {
"$ref": "#/definitions/Palette"
},
"examples": {
"rgb": [
"red",
"green",
"blue"
]
}
}
}
}
```

Now take the same function and use the dict in the place of YAML file.

```python
@app.route('/colors/<palette>/')
@swag_from(specs_dict)
def colors(palette):
"""Example endpoint returning a list of colors by palette
In this example the specification is taken from specs_dict
"""
...
```

## Using Marshmallow Schemas

> FIRST: `pip install marshmallow apispec`

```python
from flask import Flask, jsonify
from flasgger import Swagger, SwaggerView, Schema, fields


class Color(Schema):
name = fields.Str()

class Palette(Schema):
pallete_name = fields.Str()
colors = fields.Nested(Color, many=True)

class PaletteView(SwaggerView):
parameters = [
{
"name": "palette",
"in": "path",
"type": "string",
"enum": ["all", "rgb", "cmyk"],
"required": True,
"default": "all"
}
]
responses = {
200: {
"description": "A list of colors (may be filtered by palette)",
"schema": Palette
}
}

def get(self, palette):
"""
Colors API using schema
This example is using marshmallow schemas
"""
all_colors = {
'cmyk': ['cian', 'magenta', 'yellow', 'black'],
'rgb': ['red', 'green', 'blue']
}
if palette == 'all':
result = all_colors
else:
result = {palette: all_colors.get(palette)}
return jsonify(result)

app = Flask(__name__)
Swagger(app)

app.add_url_rule(
'/colors/<palette>',
view_func=PaletteView.as_view('colors'),
methods=['GET']
)

app.run(debug=True)

```

> NOTE: take a look at `examples/validation.py` for a more complete example.


> NOTE: when catching arguments in path rule always use explicit types, bad: ``/api/<username>`` good: ``/api/<string:username>``


## Using **Flask RESTful** Resources

Flasgger is compatible with Flask-RESTful you only need to install `pip install flask-restful` and then:

```python

from flask import Flask
from flasgger import Swagger
from flask_restful import Api, Resource

app = Flask(__name__)
api = Api(app)
Swagger(app)

class Username(Resource):
def get(self, username):
"""
This examples uses FlaskRESTful Resource
It works also with swag_from, schemas and spec_dict
---
parameters:
- in: path
name: username
type: string
required: true
responses:
200:
description: A single user item
schema:
id: User
properties:
username:
type: string
description: The name of the user
default: Steven Wilson
"""
return {'username': username}, 200


api.add_resource(Username, '/username/<username>')

app.run(debug=True)

```

## Handling multiple http methods and routes for a single function

You can separate specifications by endpoint or methods

```python
from flasgger.utils import swag_from

@app.route('/api/<string:username>', endpoint='with_user_name', methods=['PUT', 'GET'])
@app.route('/api/', endpoint='without_user_name')
@swag_from('path/to/external_file.yml', endpoint='with_user_name')
@swag_from('path/to/external_file_no_user_get.yml', endpoint='without_user_name', methods=['GET'])
@swag_from('path/to/external_file_no_user_put.yml', endpoint='without_user_name', methods=['PUT'])
def fromfile_decorated(username=None):
if not username:
return "No user!"
return jsonify({'username': username})
```

And the same can be achieved with multiple methods in a `MethodView` or `SwaggerView` by
registering the `url_rule` many times. Take a look at `examples/example_app`


# Use the same data to validate your API POST body.

```python
from flasgger import swag_from, validate

@swag_from('defs.yml')
def post():
validate(request.json, 'UserSchema', 'defs.yml')
# if not validate returns ValidationError response with status 400
# also returns the validation message.
```

You can also tell `swag_from` to validate automatically

```python
from flasgger import swag_from

@swag_from('defs.yml', validation=True)
def post():
# if not validate returns ValidationError response with status 400
# also returns the validation message.
```

It is also possible to define `validation=True` in `SwaggerView` and also use
`specs_dict` for validation.

Take a look at `examples/validation.py` for more information.

All validation options can be found at http://json-schema.org/latest/json-schema-validation.html

# HTML sanitizer

By default Flasgger will try to sanitize the content in YAML definitions
replacing every ```\n``` with ```
``` but you can change this behaviour
setting another kind of sanitizer.

```
from flasgger import Swagger, NO_SANITIZER

app =Flask()
Swagger(app, sanitizer=NO_SANITIZER)
```

You can write your own sanitizer

```
Swagger(app, sanitizer=lambda text: do_anything_with(text))
```

There is also a Markdown parser available, if you want to be able to render
Markdown in your specs description use **MK_SANITIZER**


# Swagger UI and templates

You can override the `templates/flasgger/index.html` in your application and
this template will be the `index.html` for SwaggerUI. Use `flasgger/ui2/templates/index.html`
as base for your customization.

Flasgger supports Swagger UI versions 2 and 3, The version 3 is still experimental but you
can try setting `app.config['SWAGGER']['uiversion']`.

```python
app = Flask(__name__)
app.config['SWAGGER'] = {
'title': 'My API',
'uiversion': 3
}
Swagger(app)

```

# Initializing Flasgger with default data.

You can start your Swagger spec with any default data providing a template:

```python
template = {
"swagger": "2.0",
"info": {
"title": "My API",
"description": "API for my data",
"contact": {
"responsibleOrganization": "ME",
"responsibleDeveloper": "Me",
"email": "me@me.com",
"url": "www.me.com",
"termsOfService": "http://me.com/terms",
"version": "0.0.1"
},
"host": "mysite.com", # overrides localhost:500
"basePath": "/api", # base bash for blueprint registration
"schemes": [
[
"http",
"https"
]
],
"operationId": "getmyData"
}

swagger = Swagger(app, template=template)

```

And then the template is the default data unless some view changes it. You
can also provide all your specs as template and have no views. Or views in
external APP.

## Extracting Definitions

Definitions can be extracted when `id` is found in spec, example:

```python
from flask import Flask, jsonify
from flasgger import Swagger

app = Flask(__name__)
Swagger(app)

@app.route('/colors/<palette>/')
def colors(palette):
"""Example endpoint returning a list of colors by palette
---
parameters:
- name: palette
in: path
type: string
enum: ['all', 'rgb', 'cmyk']
required: true
default: all
responses:
200:
description: A list of colors (may be filtered by palette)
schema:
id: Palette
type: object
properties:
palette_name:
type: array
items:
schema:
id: Color
type: string
examples:
rgb: ['red', 'green', 'blue']
"""
all_colors = {
'cmyk': ['cian', 'magenta', 'yellow', 'black'],
'rgb': ['red', 'green', 'blue']
}
if palette == 'all':
result = all_colors
else:
result = {palette: all_colors.get(palette)}

return jsonify(result)

app.run(debug=True)
```

In this example you do not have to pass `definitions` but need to add `id` to
your schemas.

 
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